Class-D amps - a different re view


Martin Colloms, the editor of HiFi Critic (ad-free mag from the UK) have recently published the review of several different Class-D amps, together with an in depth technical analysys and measurments.

His conclusions were not favourable, to say at least:

"I regret that not a single model merits unqualified recommendation. Price is not the issue; the poor listening tests speak for themselves. (...)
At present we have to take the prudent view that good sound might be possible from switching amps, but we haven't heard it yet."

BelCanto REF1000 (ICEpower) - score 10.5 pooints
"The ICE power module used has a dependable reputation, and the design is well built and finished as a whole. While I would not suggest that you shouldn't try this amp, on sound quality grounds alone I cannot recommend it for audiophile use."

Channel Islands D100 (UcD) - score 13 pooints
"While I have reservations about a number of aspects of sound quality, and advise personal audition, given the solid lab results (...) the overall performance and the moderate price, these CA Audio monos do make it to the 'worth considering' cathegory."

NuForce 8.5V2 (proprietary technology) - score 9 pooints
"Yes, the price is good for the power output. Yes it's pretty, light, small and runs cool. However, the sound quality simply does not justify recommendation." (on top of that the NuForce amp measured very poorly - Elb)

Pro-Ject Amp Box (Flying Mole) - score 5 points
"I'm sorry to say that Project (...) was a real disappointment in the listening tests, and can't be recommended."

Just as a point of reference, recently reviewed Krell 700CX scored 100 points, CJ Premier 350 - 110 points and ARC Ref 110 - 135 points.

At least someone have had the balls to say it. This is why HiFi Critic is THE mag to subscribe.
128x128elberoth2
Believe what you will. Ultra Audio, HiFi+, 6 moons, Positive
Feedback, Audio Critic (reviewing the ICE powered B&O BeoLab 5), Stereophile, Absolute Sound, etc., etc., all seem have found positive things to say about the Switching Amplifier technology. I have a Tripath based amp and I refer you to the Red Wine Audio review in the latest issue of HiFi+. It describes the sound better than I ever could. I remember all the hoo-haa when CD first came out. This all seems familiar.
In the end I have to go with my own ears. I had graduated to Plinius 102 and tried the Nuforce and ditched the Plinius without a second's thought. The Nuforce was more real, and removed the stodginess and electronic hash of the Plinius.
I recently heard one of the writer's favorite two conventional amps powering some Apogee Divas. I can't wait to get to the same place so I can wake up that tired sound with my class D amps.
As I said in my initial post - those are just his conclusions. The original review is 14 pages long - full of technical analysys, measurements and his impressions. The amps were very well run in (500h), he tried varoius power cords, varoius inputs, varoius cables, supports and associated equipment. It really is one of the most complete reviews I have read in a long time.

If anyone is interested how he came to those conclusions, I suggest you get the copy of the mag. Sorry, I cannot reprint more of his writing (I prolly already have broken some copyrights), especially that it comes from the current issue.

The mag is expensive (it has to be since it is ad-free), but it is worth every penny IMO.

BTW - I have nothing against Class-D. I have owned BelCanto eVo 4 mk II (Tripath based) and also evaluated for an extended period of time the ICEpower design in my system.

The original title for this post was "Class-D amps - a different (re)view" but somehow the brackets were removed by AudiogoN software. It changes the meaning a bit.